US2216758A - Twisting reinforcements for concrete - Google Patents
Twisting reinforcements for concrete Download PDFInfo
- Publication number
- US2216758A US2216758A US106642A US10664236A US2216758A US 2216758 A US2216758 A US 2216758A US 106642 A US106642 A US 106642A US 10664236 A US10664236 A US 10664236A US 2216758 A US2216758 A US 2216758A
- Authority
- US
- United States
- Prior art keywords
- twisting
- bars
- concrete
- reinforcements
- ribs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49616—Structural member making
- Y10T29/49623—Static structure, e.g., a building component
- Y10T29/49632—Metal reinforcement member for nonmetallic, e.g., concrete, structural element
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
Definitions
- the present invention makes use of this fact for the manufacture of metal 5 reinforcements for concrete, in such manner that a substantially round section bar, having continuous or interrupted ribs or projections, is subjected to twisting in the cold state, with the result that the profile obtained has increased to bonding capacity and also a very considerably increased elastic limit without harmful effects arising and without the modulus of elasticity being modified.
- An embodiment comprising a substantially 20 round section bar with two diametraily opposite ribs is preferable.
- the twisting in the cold state, cross-sectional swelling being preferably avoided, is carried to an extent at which 30 the desired elastic limit. is attained, the convolutions being made as flat as possible because the flatter they are the greater the bonding capacity.
- Examination of the structure enables one to ascertain if the bars have beentwisted in the 35 cold or the warm state. If the latter, then only the bonding capacity is increased; but increase in the bonding capacity, accompanied by little or no increase of the elastic limit, has no practical advantages. Only by also increasing the elastic a limit is any practical advantage obtained.
- reinforcing material made according to the invention has properties which have not been achieved hitherto by any known process. It atfords the possibility of achieving a considerable saving in weight and costs in a reinforced concrete construction without reducing its carrying capacity and in spite of the use of the cheapest reinforcing material. 5 Substantially round bars with ribs as aforesaid made of metals other than iron may be subjected to the method according to the invention to obtain an increase of the tension and compression elastic limits with simultaneous increase of the bonding capacity.
- Fig. 1 illustrates a bar in accordance with. the present invention prior to the twisting operation.
- Fig. 2 is a transverse section of the same.
- Fig. 3 is a view in elevation showing the bar after twisting.
- Fig. 6 shows the bars of Fig. 4 intertwisted following their independent twisting.
- the bars I are provided with two longitudinal diametrically opposed ribs 2.
- the ribs 2 are in spiral form.
- Fig. 4 two bars 3 and 4 are shown each, as will be plain from the sectional view in Fig. 5, having a single rib, the bar 3 having a rib 5 and the bar 4 having a rib 6. These bars are inde- 40 pendently twisted and are then relatively intertwisted, as indicated in Fig. 6.
- a method for the manufacture of steel reinforcements for concrete consisting in providing bars of round section with at least one lon tudinal rib on each, twisting the bars individually so that the ribs each take a spiral shape, intertwisting said bars while in a cold state, and simultaneously subjecting the bars to a positive axial stress for lengthening the bars during inter-twisting operation.
- RUDOLF SCHMIDT A method for the manufacture of steel reinforcements for concrete, consisting in providing bars of round section with at least one lon tudinal rib on each, twisting the bars individually so that the ribs each take a spiral shape, intertwisting said bars while in a cold state, and simultaneously subjecting the bars to a positive axial stress for lengthening the bars during inter-twisting operation.
Description
I Oct. 8, R SCHM|DT I 2,216,758
7 wzswme asmmncsmsms FOR doncas'rs Filed Oct. 20; 1936 F131 Fi .3 Fig.4 Fi .0
F193 Fig.5
1- I I 5 e 6 Patented Oct. 8, 1940 PATENT OFFlCE TWISTING REINFORCEMENTS FOR CONCRETE Rudolf Schmidt, Vienna, Austria Application October 20, 1936, Serial No. 106,642 In Austria October 30, 1935 1 Claim.
It is known that the strength of rolled iron may be very considerably increased by twisting in the cold state. The present invention makes use of this fact for the manufacture of metal 5 reinforcements for concrete, in such manner that a substantially round section bar, having continuous or interrupted ribs or projections, is subjected to twisting in the cold state, with the result that the profile obtained has increased to bonding capacity and also a very considerably increased elastic limit without harmful effects arising and without the modulus of elasticity being modified.
Such a result cannot be obtained with square 15 or triangular section bars, since if these are employed in cold twisted condition, cracking effects in the concrete arise, apart from the tendency of crack formation at the edges of the bars.
An embodiment comprising a substantially 20 round section bar with two diametraily opposite ribs is preferable. In this connection it is to be noted that there is no advantage in practice in increasing the number of ribs beyond two,
which in rolling and in the application of rein- 25 forcement for concrete appear to be most favorable.
According to the invention the twisting in the cold state, cross-sectional swelling being preferably avoided, is carried to an extent at which 30 the desired elastic limit. is attained, the convolutions being made as flat as possible because the flatter they are the greater the bonding capacity. Examination of the structure enables one to ascertain if the bars have beentwisted in the 35 cold or the warm state. If the latter, then only the bonding capacity is increased; but increase in the bonding capacity, accompanied by little or no increase of the elastic limit, has no practical advantages. Only by also increasing the elastic a limit is any practical advantage obtained.
Experiments have yielded the following data:
Increase, per cent Thus, reinforcing material made according to the invention has properties which have not been achieved hitherto by any known process. It atfords the possibility of achieving a considerable saving in weight and costs in a reinforced concrete construction without reducing its carrying capacity and in spite of the use of the cheapest reinforcing material. 5 Substantially round bars with ribs as aforesaid made of metals other than iron may be subjected to the method according to the invention to obtain an increase of the tension and compression elastic limits with simultaneous increase of the bonding capacity.
It has also been found to be of advantage to twist together, or twist together and stretch, two or more round section bars (with ribs as afore said) which have themselves been twisted in the cold state. the elastic limit being thereby increased beyond the extent which has been known so far in connection with bars twisted together.
The invention is illustrated in the accompanying drawing, in which:
Fig. 1 illustrates a bar in accordance with. the present invention prior to the twisting operation.
Fig. 2 is a transverse section of the same. Fig. 3 is a view in elevation showing the bar after twisting.
of Fig. 4.
Fig. 6 shows the bars of Fig. 4 intertwisted following their independent twisting.
In Figs. 1 to 3, the bars I are provided with two longitudinal diametrically opposed ribs 2. When the bar has been longitudinally twisted, as in Fig. 3, the ribs 2 are in spiral form.
In Fig. 4 two bars 3 and 4 are shown each, as will be plain from the sectional view in Fig. 5, having a single rib, the bar 3 having a rib 5 and the bar 4 having a rib 6. These bars are inde- 40 pendently twisted and are then relatively intertwisted, as indicated in Fig. 6.
I claim:
A method for the manufacture of steel reinforcements for concrete, consisting in providing bars of round section with at least one lon tudinal rib on each, twisting the bars individually so that the ribs each take a spiral shape, intertwisting said bars while in a cold state, and simultaneously subjecting the bars to a positive axial stress for lengthening the bars during inter-twisting operation. RUDOLF SCHMIDT.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT2216758X | 1935-10-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2216758A true US2216758A (en) | 1940-10-08 |
Family
ID=3690126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US106642A Expired - Lifetime US2216758A (en) | 1935-10-30 | 1936-10-20 | Twisting reinforcements for concrete |
Country Status (1)
Country | Link |
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US (1) | US2216758A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2723702A (en) * | 1951-11-27 | 1955-11-15 | Walter Huguenin | Process for the production of colddeformed rods of the kind used for reinforcing concrete |
DE1052428B (en) * | 1956-07-27 | 1959-03-12 | Hoesch Westfalenhuette Ag | Use of a steel for concrete reinforcement bars |
DE1087151B (en) * | 1954-10-06 | 1960-08-18 | Kloeckner Huettenwerk Haspe Ag | Use of wires or rods made of Thomasstahl for the production of concrete reinforcement mats |
US2957240A (en) * | 1956-08-17 | 1960-10-25 | Robert A Brandes | Method of making concrete reinforcing elements from ribbed steel bars |
US3076533A (en) * | 1957-11-29 | 1963-02-05 | Nat Res Dev | Stabilisation of wind-excited structures |
US3099109A (en) * | 1958-03-01 | 1963-07-30 | Zueblin Ag | Device for anchoring tensioning elements |
US3187466A (en) * | 1961-04-13 | 1965-06-08 | Armco Steel Corp | Tensioning unit |
DE977401C (en) * | 1951-12-30 | 1966-04-07 | Nockenstahl G M B H | High strength rebar |
US3725999A (en) * | 1966-09-14 | 1973-04-10 | M Birkenmaier | Method of prestressing concrete pressure tanks |
US4897117A (en) * | 1986-03-25 | 1990-01-30 | Teledyne Industries, Inc. | Hardened penetrators |
US5676013A (en) * | 1995-07-26 | 1997-10-14 | Kahlau; Bernhard K. | Spiral component for a baluster and method and machine for making same |
WO2013151580A1 (en) * | 2012-04-03 | 2013-10-10 | Polytorx, Llc | Concrete reinforcing fibers |
US11845693B2 (en) | 2018-05-18 | 2023-12-19 | Pensmore Reinforcement Technologies, Llc | Twisted reinforcement fibers and method of making |
-
1936
- 1936-10-20 US US106642A patent/US2216758A/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2723702A (en) * | 1951-11-27 | 1955-11-15 | Walter Huguenin | Process for the production of colddeformed rods of the kind used for reinforcing concrete |
DE977401C (en) * | 1951-12-30 | 1966-04-07 | Nockenstahl G M B H | High strength rebar |
DE1087151B (en) * | 1954-10-06 | 1960-08-18 | Kloeckner Huettenwerk Haspe Ag | Use of wires or rods made of Thomasstahl for the production of concrete reinforcement mats |
DE1052428B (en) * | 1956-07-27 | 1959-03-12 | Hoesch Westfalenhuette Ag | Use of a steel for concrete reinforcement bars |
US2957240A (en) * | 1956-08-17 | 1960-10-25 | Robert A Brandes | Method of making concrete reinforcing elements from ribbed steel bars |
US3076533A (en) * | 1957-11-29 | 1963-02-05 | Nat Res Dev | Stabilisation of wind-excited structures |
US3099109A (en) * | 1958-03-01 | 1963-07-30 | Zueblin Ag | Device for anchoring tensioning elements |
US3187466A (en) * | 1961-04-13 | 1965-06-08 | Armco Steel Corp | Tensioning unit |
US3725999A (en) * | 1966-09-14 | 1973-04-10 | M Birkenmaier | Method of prestressing concrete pressure tanks |
US4897117A (en) * | 1986-03-25 | 1990-01-30 | Teledyne Industries, Inc. | Hardened penetrators |
US5676013A (en) * | 1995-07-26 | 1997-10-14 | Kahlau; Bernhard K. | Spiral component for a baluster and method and machine for making same |
WO2013151580A1 (en) * | 2012-04-03 | 2013-10-10 | Polytorx, Llc | Concrete reinforcing fibers |
US10266970B2 (en) | 2012-04-03 | 2019-04-23 | Pensmore Reinforcement Technologies, Llc | Concrete reinforcing fibers |
US11845693B2 (en) | 2018-05-18 | 2023-12-19 | Pensmore Reinforcement Technologies, Llc | Twisted reinforcement fibers and method of making |
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